Malicious PDF — malware analysis report

Static analysis result for SHA-256 992c88380dc2f44b…

MALICIOUS

PDF

125.3 KB Created: 2021-07-02 12:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 9d884437694a82baee8e555cfec56b27 SHA-1: 1bb1366e04d78df62f3f5521d6b19a4e958ab420 SHA-256: 992c88380dc2f44bdb7a164002076e500f48e9092c2493793e8a7f5ef6381de4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/i8h5f51td0q7rv408j5ee7brgc/gukolemozadufupa.pdf In PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/95313a3977e8010be212f735c2c7cabe/29730098007.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/sibufuz.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/tokot.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/22638342457.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/ke16qnrel0j0fbb8mu24dlrjfa/83323184168.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/xelurakawebe.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/ebe9cd4cec0076c1b13d1bed86ac302b/malewifapebini.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/qqn408fh83j03bulrklsi7ei38/57584759294.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/0k578qcu8uju3ki3fkuqhpv5aq/99606468912.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/pizefolanowajexaweb.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b4efcdc747d---10521516048.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/fbe0b2409b434da343043f96fc3fb791/99638307794.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716fdc0322d---50418074582.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/muzelugemekim.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/021d5ea4ece78fcc195e313bd42db90c/84061091868.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160780274e7ec2---75118675104.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/82149073344.pdfIn PDF document text
    • https://medtek.vn/storage/file/26798058459.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/xawujasagonuzafadu.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc7eb4271---vupakopirevuxepujotapew.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d3a216a6e---4033710556.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/d5282ea7a7b6d2e7177ec51c587c05b4/48101351160.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cf36d8e7e---81579541682.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/qcvkvugsgtrc9fe10qp8aboti2/62837164049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=pokemon+x+and+y+guide+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000171f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171F2 19808 bytes
SHA-256: 09e6319d550ccce654c7dc260221f4d50a0e93d714403fe89506bc1a4c2bedcf
font_01_sfnt_off0001a4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4F9 10836 bytes
SHA-256: bb797481474845892168caf5bcc5e295c928d55738fd437b24d0e5f1598400d6
font_02_sfnt_off0001bdc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BDC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001d5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D5D5 4660 bytes
SHA-256: b0561a0304481ac9d5509f6679cca64eb9dcc10a4fd73e37c23318ea075e55f8

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